Q. No.A woman has four daughters. The chance that her next child will be a son is:
1.
1
2.
0
3.
\(1 \over 2\)
4.
\(1 \over 4\)
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In Drosophila melanogaster cinnabar eye is a sex-linked recessive trait. A female fly having cinnabar eyes is crossed with a wild-type male. The percentage of the male progeny of this cross with cinnabar eyes is expected to be:
| 1. | 0% | 2. | 25% |
| 3. | 50% | 4. | 100% |
Eye color in a fly is inherited via a single gene with seven different alleles. How many different types of gametes would be possible in this system in an individual fly?
1. 2
2. 7
3. 28
4. 56
Nondisjunction of a pair of homologous chromosomes occurs during the anaphase of meiosis I. The four gametes produced as a result of this nondisjunction event will be:
| 1. | n + 1; n + 1; n - 1; n - 1 | 2. | n + 1; n - 1; n; n |
| 3. | n + 1; n - 1; n - 1; n - 1 | 4. | n + 1; n + 1; n; n |
The inheritance of the trait shown in the given pedigree most likely is:
| 1. | Autosomal recessive | 2. | Autosomal dominant |
| 3. | Sex-linked recessive | 4. | Sex-linked dominant |
The inheritance of genes finds a parallel with the behavior of chromosomes, especially during cell division for gamete formation. Such parallels include:
| I: | they are both present in pairs in all diploid cells and one of the pairs is present in the gamete |
| II: | they both undergo segregation during meiosis. |
| III: | their copy numbers in the cell decrease after meiosis, and increase during fertilization. |
| IV: | they are both copied during the S phase of the cell cycle. |
| 1. | I, II and III only | 2. | I, II and IV only |
| 3. | II, III and IV only | 4. | I, II, III and IV |
Identify the condition where the following karyotype is expected:
1. Klinefelter’s syndrome
2. Cri du chat syndrome
3. Turner’s syndrome
4. Down’s syndrome
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Which of the following experiments can show a gene to be located on the X-chromosome?
I. set up reciprocal crosses
II. set up two point test cross
1. Only I
2. Only II
3. Neither I nor II
4. Both I & II
A man and woman who both have normal pigmentation but both having an albino parent have two children both with normal pigmentation. What is the probability that their child might be an albino?
1. 0
2. ¼
2. ½
3. ¾
Identify the chromosomal aberration:
| 1. | Inversion | 2. | Reciprocal translocation |
| 3. | Deletion | 4. | Duplication |
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